bringing rpi3 POE hat fan to the mainline kernel?

[greyltc]

The fan on my rpi3's poe hat[1] doesn't magically work with the linux-aarch64 mainline kernel like it does with the linux-raspberrypi kernel. Anyone know what it might take to get working in mainline?

I've looked around and found this that might be helpful[2].

[1]: https://www.raspberrypi.org/products/poe-hat/
[2]: https://github.com/raspberrypi/linux/bl ... verlay.dts

[lategoodbye]

In case your interested in a "works for me" solution, take a look at this branch (last 2 patches):
https://github.com/lategoodbye/rpi-zero ... pi-poe-hat

Since mainline doesn't have full overlay support, you need to modify the DTS of your target board according to the example in the binding document.

Disclaimer: i don't own this hardware so i never tested it.

[summers]

Overlays can be done in mainline using $this->bbcode_second_pass_code('', 'fdt apply') in uboot. See https://archlinuxarm.org/forum/viewtopic.php?f=23&t=12635&start=10#p58062,

This needs uboot compiled with the right flags, but I'd expect that to be the case on boards which often have overlays ...